I've used this app a bunch of times to generate quick invoices with Stripe.

Webflow

The freelancer's life comes with more ups and downs than your average roller coaster. These tools will help you manage it all - with a modicum of screaming. As a freelancer, time's your most valuable asset. So a toolset that makes managing and tracking your time easy is crucial.

Simple invoicing & ACH payments for freelancers

I love Bonsai for contracts, proposals and invoicing. They have a simple beautiful interface and are constantly releasing new features and are always checking in to see what else I need for my business.

Romain Lapeyre- Co-founder @Gorgiasio

Bonsai came strongly recommended by a few friends. Their whole solution is well integrated with payments and contracts and I think it’s free for freelancers (couldn’t find any information on it though).

Insanely simple invoicing

Send beautiful invoices with built-in payment in seconds

The easiest way for freelancers to send professional invoices and get paid on time. Send invoices in seconds, securely store clients credit cards, schedule recurring billing, and more.

Laurent Perrier- Entrepreneur - Developer

I'm probably biased but I've yet to come across an easier product for invoicing clients. Payments are built-in with Stripe and invoices get paid in 24 hours on average. Not free, but hopefully $10 a month should be affordable to most!

Laurent Perrier- Entrepreneur - Developer

I used to dread invoicing and waiting for payments. Not anymore!

Laurent Perrier- Entrepreneur - Developer

Setup recurring payments in seconds, integrate with your own Stripe account for when you want to switch to a custom integration, and no percentage based pricing so you can keep your cost down.